Grain separator



Sept. F. BUNE GRAIN sEPARAToR,

Filled Aug. 2e. 192s Patented Sept. 13, 1927.

UNITED 'siTAT ES rm'rz BUNSE, OFHESPERINGHAUSEN, NEAR NIEDERf-MARSBERG, GERMANY.,

GBAIN SEPB'ATOR.

f A jpplication filed"` August 26, I1926,n Serial No; 1131,751, `and :in "Germany August 27,y 1925.

v My inventionrelates .to grain separators, such as are used for separating tares vfrom -the-- grain, 'and for separatingone kind of rain. from: anoth'errand' similarA purposes. uchseparators consist- 'substantiallyv of. a revolving ,cylindrical .drum providedon.v its :innerzsurface with grooves orcells for rais- 'ing one kind-ofy grain. In the drumis a collecting' hopper-'with a worm .forfconveying away the. grainwhich hasbeen raised. v In order-to increase the output of such lseparators the speed of revolution is increased. .An example-.of .this kind-.of separator is shown in my previous specification-No. 1,590,7 23 of 29th June, 1926.

In separating' fort instance, wheat p from oats,when almost all-thegrain is raised b v the drum cells into'thecollecting hopper and only a few grains-reach the outlet-end of the drum,'too many vgrains of 'wheat will-be left ,in-the' separated oats. Myfinvention is based on the recognition. of fthe Vfact that this incomplete separation is due in the first place to a too great speed of revolution of the separating cells; fthela-yer of mixed gralns, which is very thin-at .the .end of the drum, consisting frequently only of single grains, tends to jump about on the drum and only in rare cases reaches the rapidly moving drum cells. My invention consists in this that the diameter of the cylindrical sepa-rating drum is reduced at the outlet end of the same, thus providing a separating zone, under which the separating cells travel at a slower speed. This reduction in the diameter of the drum may either be gradual or in steps, the reduced portion alone or this portion together with an adjacent cylindrical portion forming the separating zone, under which t-he cells travel at a reduced speed. My invention covers all these possible means of construction, the accompanying drawing showing several constructional forms by way of example, to which the invention is not intended to be limited.

In the drawing, Figure 1 is a diagrammat-ic view of the separator according to the present invention in vertical longitudinal section. Figure 2 is a cross section on the line A-B of Figure 1. Figure 3 shows a second constructional form of the invention, in-

partial longitudinal section and Figure 4 a modified form of the same. Figure 5 shows another constructional form in longitudinal section through a part of the separator.

According to Figures 1. and 2, a somewhat 'inclined driving shaft 3is1journalled in bearings 2 mounted onfthe frame 1, beltfpulleys 4 y belng for instance.- provided on the l shaft 'for driving it .from a motor. A- disc 5 having a funnelfshaped centralopening 6 issupported by .arms 7 .on a hub 8 keyed tothe .driving shaft .3. On the disc 5 is mounted the'separating drum 9 which mayfvbe'fixed to it means of screws, byk welding or the like. The inside Vof .the drum 9fis provided withthe well known sorting cells 9. Into the opening 6 in the funnel-shaped part of the disc 5 reaches, for'instance, a stationary cylindrical casing 10 which is provided with a filling hopper 11 for the grain to be sepaf thehopper is suspended. directly yon the shaft 3 and.. can be fixed to the frame 1 by a screw 15,1.preferably .in an. adjustable manner. On the hopper 13 is a rotatable worm conveyor 16, the hub 16 of which can be fixed to .the driving shaft 3 and which conveys the raised grains to the outlet 17 ofthe hopper. According to the present invention a tapered portion 18 is provided at the outlet end of the cylindrical separating drum 9, which is also provided with sorting cells 18' and through which the mixed grains must pass beforev leaving the drum. This tapered portion 18 may be made integral with the drum 9 as shown in Figure 1, or may form a separate part which must then be connected to the drum 9 in a suitable manner for instance by means of a ring 19 surrounding both parts, as shown in broken lines in Figure 1. The drum V9 performs the main part of the separating work, raisingthe greater portion of the grain into the hopper 13 and allowing only a small amount ofthe grain to pass into the tapered part 18 through which the hopper 13 is extended, the collecting wall 13 of the hopper being set back in this portion if-necessary (see Fig. 2). In the tapered part 18 the grain is gradually pushed into zones, the cells 18 of which yrevolve at a considerably slower speed than the cells 9. In these zones at the end of the drum the grains to be separated are given time to fall into the cells 18', by Which they are raised into the hopper 13. The grain leaving the drum 9, 18 at 20' will be thoroughly clean. At 21 the grains raised by the cells 9 and 18 leave the separator.

The constructional form shown in Figure 3 differs from that shown in Figures 1 and 2, in that a. short separating cylinder 24 is provided at the end of the tapered part 1S. As indicated diagrammatically in Figure L1, in such a constructional form a tapered part 18 may be Wit-hout cells, so that it acts only as a means for conveying the grain from the cell drum 9 to the cell drum 211.

In the constructional form shown in Figure 5 two cylindrical cell drums 95, 2115 of dilferent diameter are inserted one lin the other, being connected by a ring 22. l/Vhen the axis of the drum is suitably inclined, the grain to be separated Will climb Without any auxiliary means over the shoulder 28.

The manner in which the separating drum is mounted is immaterial. Hence the invention is applicable to separators or .sorters in Which the separating` drum is not mounted on a 4driving shaft (3) but on rollers, such as are shown for instance in Patent 945,497.

The axis of the drum may also be arranged horizontally.

What I Claim is y 1. A grain separator comprising in combination a rotatable cylindrical drum having recesses in its inner surface for receiving the lgrains and an extension at the delivery end of the drum also having recesses on its inner surface which extension decreases in diameter to the delivery end thereof, as and for the purpose set forth.

2. A grain separator comprisingin coinbination a rotatable cylindrical drum having recesses in its inner surface for receiving the grains and an extension at the delivery end of the drum also Ahaving recesses on its inner surface which extension tapers to the delivery end thereof, as and forthe purpose set forth,

3. A grain separator comprising in combination a rotatable cylindrical drum havingl recesses in its inner surface for .receiving the grains, an extension at the delivery end of the drum, also having` recesses' on its' inner surface Whichextension tapers to the delivery' end thereof, and a cylindrical extension at the delivery end of the said tapered extension, having the same diameter as the smallest diameter thereof and having recesses on its inner surface, as and for the purpose set forth. Y

1. A grain separator comlirising` in conibination a rotatable cylindrical drum having recesses in its inner surface for receiving the grains, a smooth tapered extension at the delivery end of the drum and a second cylindrical drum of the same diameter as the small end of the tapered-extension and having recesses in its inner surface for receiving` the grains, as and for the purpose set forth.

In testimony whereof I have signed my name to this specification.

FRITZ BUN SE.- 

